Shampoo compositions and method

ABSTRACT

An aqueous conditioning shampoo composition comprising, in addition to water: 
     i) at least one surfactant chosen from anionic, nonionic, zwitterionic or amphoteric surfactants or mixtures thereof: 
     ii) emulsified particles of an insoluble, nonvolatile silicone; 
     iii) a soluble cationic hair conditioning polymer having a cationic charge density of about +3.0 meq/gram or less, 
     in which the emulsified particles of insoluble, nonvolatile silicone are incorporated into the shampoo composition as a preformed aqueous emulsion having an average silicone particle size in the emulsion and in the shampoo composition of from 2 to 30 microns.

This is a divisional of Ser. No. 08/905,582, filed Aug. 4, 1997, nowU.S. Pat. No. 5,977,038.

FIELD OF THE INVENTION

This invention relates to shampoo compositions, and more particularly toshampoo compositions containing emulsified particles of silicone, whichcompositions condition the hair leaving it softer and more manageable.

BACKGROUND OF THE INVENTION

The use of silicones as conditioning agents in cosmetic formulations iswell known and widely documented in the patent literature. Generally,dispersed droplets of the silicone oil are suspended in the composition,which is then applied to the hair to deposit the silicone material onthe hair shaft.

A typical method of silicone shampoo manufacture is disclosed in WO92/10162. Essentially, the silicone material is emulsified directly intothe shampoo by an in situ hot process, in which the complete shampoomixture incorporating the silicone is mixed thoroughly at elevatedtemperature, pumped through a high shear mill and then cooled. Thesilicone can be dispersed in a first process stage with anionicsurfactant and fatty alcohol to form a premix. The premix is then mixedwith the remaining materials of the shampoo, pumped through a high shearmill, and cooled to obtain the final composition.

A disadvantage associated with an in situ hot process such as isdescribed in WO 92/10162 is that factory handling of viscous siliconeoil is difficult in the context of a full shampoo manufacturingoperation.

A further disadvantage is that special equipment is normally needed tocontrol silicone particle size during manufacture. GB 2 170 216 Adiscloses a similar process, in which the full shampoo compositionincorporating insoluble, non-volatile silicone is sheared with a highshear mixer until the silicone particles are on average less than 2microns in diameter. The particle size distribution is then said to befrom about 2 to about 55 microns.

In order to solve the above mentioned problems with in situ hotprocessing of silicone, the alternative of incorporating the silicone asa preformed aqueous emulsion has been proposed. Such a method has theconsequences that the silicone is incorporated with a predeterminable,controllable particle size distribution. The silicone is insoluble andremains emulsified in the fully formulated shampoo composition, and thusthe step of high shear processing of the silicone within the fullyformulated shampoo composition is not required. This also makesmanufacture of the compositions easier.

A typical method for incorporating insoluble, non-volatile siliconematerials into a conditioning shampoo is disclosed in U.S. Pat. No.5,085,857 in which such materials are incorporated in the shampoocomposition as a pre-formed aqueous emulsion of average particle sizeless than 2 microns. All the ingredients are mixed in a simple hot orcold process in which the average particle size of the silicone materialin the emulsion remains the same in the final shampoo composition.Preferably, this size is from 0.01 to 1 micron, e.g. 0.4 micron.

EP 0 529 883 A1 discloses hair shampoo compositions made by anequivalent method and comprising microemulsified particles of siliconehaving a particle size of 0.15 microns or less, e.g., 0.036 microns.Reducing the silicone particle size still further in this way is said toimprove stability, optical properties and conditioning performance.

The shampoos of U.S. Pat. No. 5,085,087 and EP 0 529 883 A1 require thepresence of a cationic polymer to deposit the silicone efficiently fromthe formulation onto the hair. A problem encountered with these smallparticle size silicone/cationic polymer formulations is that they cangive an undesirable sensory feel, typically manifest as a perception of“slippiness” and/or heaviness on dry hair.

We have now found that the utilisation of insoluble, non-volatilesilicone, in the form of an aqueous, preformed emulsion of largeparticle size in a surfactant-based shampoo composition will impartconditioning benefit to the hair without the dry hair sensory negativesassociated with the prior art compositions discussed above.

Surprisingly and advantageously, we have found that in compositions ofour invention, the presence of cationic polymer selectively enhances thewet properties of the shampoo, e.g., wet feel and ease of wetcomb—whilst reducing the ease of dry combing. In contrast, we found thatthe presence of cationic polymer in prior art formulations incorporatingcationic polymer and smaller particle size pre-formed silicone emulsionsdid not give a selective increase in ease of wet combing. Ease of drycombing was increased to at least the same extent.

The selective enhancement of wet properties such as ease of wet combingobserved with compositions of the present invention is of benefit to theconsumer. This is because consumers need to detangle their hair easilywhen wet, but when it is dry, if the hair slips through the comb tooeasily then it can be difficult to put into style.

SUMMARY OF THE INVENTION

The invention provides an aqueous shampoo composition comprising, inaddition to water:

i) at least one surfactant chosen from anionic, nonionic, zwitterionicor amphoteric surfactants or mixtures thereof;

ii) emulsified particles of an insoluble, nonvolatile silicone;

iii)a cationic hair conditioning polymer having a cationic chargedensity of about +3.0 meq/gram or less,

in which the emulsified particles of insoluble, non-volatile siliconeare incorporated into the shampoo composition as a preformed aqueousemulsion having an average silicone particle size in the emulsion and inthe shampoo composition of from 2 to 30 microns.

In another aspect, the invention provides a method of making such ashampoo composition, by mixing together water, the surfactant, thecationic conditioning polymer and a preformed aqueous emulsion of thesilicone, wherein the silicone in the emulsion and in the shampoocomposition has an average particle size of from 2 to 30 microns.

DETAILED DESCRIPTION OF THE INVENTION

i) Surfactant

The composition according to the invention comprises a surfactant chosenfrom anionic, nonionic, zwitterionic or amphoteric surfactants ormixtures thereof.

Suitable anionic surfactants include the alkyl sulphates, alkyl ethersulphates, alkaryl sulphonates, alkanoyl isethionates, alkyl succinates,alkyl sulphosuccinates, N-alkoyl sarcosinates, alkyl phosphates, alkylether phosphates, alkyl ether carboxylates, and alpha-olefinsulphonates, especially their sodium, magnesium ammonium and mono-, di-and triethanolamine salts. The alkyl and acyl groups generally containfrom 8 to 18 carbon atoms and may be unsaturated. The alkyl ethersulphates, alkyl ether phosphates and alkyl ether carboxylates maycontain from one to 10 ethylene oxide or propylene oxide units permolecule, and preferably contain 2 to 3 ethylene oxide units permolecule.

Examples of suitable anionic surfactancs include sodium oleyl succinate,ammonium lauryl sulphosuccinate, ammonium lauryl sulphate, sodiumdodecylbenzene sulphonate, triethanolamine dodecylbenzene sulphonate,sodium cocoyl isethionate, sodium lauroyl isethionate and sodiumN-lauryl sarcosinate. The most preferred anionic surfactants are sodiumlauryl sulphate, triethanolamine lauryl sulphate, triethanolaminemonolauryl phosphate, sodium lauryl ether sulphate 1EO, 2EO and 3EO,ammonium lauryl sulphate and ammonium lauryl ether sulphate 1EO, 2EO and3EO.

Nonionic surfactants suitable for use in compositions of the inventionmay include condensation products of aliphatic (C₈-C₁₈) primary orsecondary linear or branched chain alcohols or phenols with alkyleneoxides, usually ethylene oxide and generally having from 6 to 30ethylene oxide groups. Other suitable nonionics include mono- ordi-alkyl alkanolamides. Example include coco mono- or di-ethanolamideand coco mono-isopropanolamide.

Amphoteric and zwitterionic surfactants suitable for use in compositionsof the invention may include alkyl amine oxides, alkyl betaines, alkylamidopropyl betaines, alkyl sulphobetaines (sultaines), alkylglycinates, alkyl carboxyglycinates, alkyl amphopropionates,alkylamphoglycinates alkyl amidopropyl hydroxysultaines, acyl tauratesand acyl glutamates, wherein the alkyl and acyl groups have from 8 to 19carbon atoms. Examples include lauryl amine oxide, cocodimethylsulphopropyl betaine and preferably lauryl betaine, cocamidopropylbetaine and sodium cocamchopropionate.

The surfactants are present in shampoo compositions o. the invention inan amount of from 0.1 to 50% by weight, preferably from 0.5 to 30% byweight.

Generally, the surfactants are present in shampoo compositions of theinvention in an amount of from 0.1 to 50%, preferably from 5 to 30%,more preferably from 10% to 25% by weight.

ii) Silicone

The shampoo composition of the invention also comprises an insoluble,non-volatile silicone, which may be one or more polyalkyl siloxanes, oneor more polyalkylaryl siloxanes, or mixtures thereof. The silicone isinsoluble in the aqueous matrix of the composition and so is present inan emulsified form, with the silicone present as dispersed particles.

Suitable polyalkyl siloxanes include polydimethyl siloxanes which havethe CAFTAN designation dimethicone, having a viscosity of from 5 to100,000 centistokes at 25° C. These siloxanes are available commerciallyfrom the General Electric Company as the Viscasil series and from DowCorning as the DC 200 series. The viscosity can be measured by means ofa glass capillary viscometer as set out further in Doe Corning CorporateTest Method CTM004 Jul. 20, 1970.

Also suitable is polydiethyl siloxane.

The polyalkylaryl siloxanes which may be used in the compositions of theinvention include polymethylphenyl polysiloxanes having a viscosity offrom 15 to 65 centistokes at 25° C. The siloxanes are availablecommercially from the General Electric Company as SF1075 methyl phenylfluid or from Dow Corning as 556 Cosmetic Grade Fluid.

Also suitable are silicone gums, such as those described in U.S. Pat.No. 4,152,416 (Spitzer), and on General Electric Silicone Rubber productData Sheet SE 30, SE 33, SE 54 and SE 76. “Silicone gums” denotespolydiorganosiloxanes having a molecular weight of from 200,000 to1,000,000 and specific examples include polydimethyl siloxane polymers,polydimethyl siloxane/diphenyl/methylvinylsiloxane copolymers,polydimethylsiloxane/methylvinylsiloxane copolymers and mixturesthereof.

Aminofunctional silicones which have the CTFA designationamodimethicone, are also suitable for use in the compositions of theinvention, as are polydimethyl siloxanes having hydroxyl end groups(which have the CTFA designation dimethiconol).

The silicone materials described above are incorporated in the shampoocomposition of the invention as a pre-formed aqueous emulsion. Theaverage particle size of the silicone material in this emulsion and inthe shampoo composition is from 2 to 30 microns, preferably from 2 to 20microns, more preferably 3 to 10 microns. Particle size may be measuredby means of a laser light scattering technique, using a 2600D ParticleSizer from Malvern Instruments.

The pre-formed emulsion may be prepared by high shear mechanical mixingof the silicone and water, or by emulsifying the insoluble, non-volatilesilicone with water and an emulsifier—mixing the silicone into a heatedsolution of the emulsifier for instance, or by a combination ofmechanical and chemical emulsification. A further suitable technique forpreparation of the emulsions is emulsion polymerisation. Emulsionpolymerised silicones as such are described in U.S. Pat. No. 2,891,920(Hyde), U.S. Pat. No. 3,294,725 (Findlay) and U.S. Pat. No. 3,360,491(Axon).

Any surfactant materials either alone or in admixture may be used asemulsifiers in the preparation of the pre-formed silicone emulsions.Suitable emulsifiers include anionic, cationic and nonionic emulsifiers.Examples of anionic emulsifiers are alkylarylsulphonates, e.g., sodiumdodecylbenzene sulphonate, alkyl sulphates e.g., sodium, laurylsulphate, alkyl ether sulphates, e.g., sodium lauryl ether sulphate nEO,where n is from 1 to 20 alkylphenol ether sulphates, e.g., octylphenolether sulphate nEO where n is from 1 to 20, and sulphosuccinates, e.g.,sodium dioctylsulphosuccinate.

Examples of nonionic emulsifiers are alkylphenol ethoxylates, e.g.,nonylphenol ethoxylate nEO, where n is from 1 to 50, alcoholethoxylates, e.g., lauryl alcohol nEO, where n is from 1 to 50, esterethoxylates, e.g., polyoxyethylene monostearate where the number ofoxyethylene units is from 1 to 30.

Typically, a pre-formed emulsion will contain around 50% of silicone.Pre-formed emulsions are available from suppliers of silicone oils suchas Dow Corning, General Electric, Union Carbide, Wacker Chemie, ShinEtsu, Toshiba, Toyo Beauty Co, and Toray Silicone Co. Examples are thematerial sold as DC-1310 by Dow Corning, and the materials sold asX-52-1086, X-52-2127 and X-52-2112 by Shin-Etsu.

The compositions of the invention typically contain from 0.01 to 20% byweight, preferably from 0.1 to 10%, more preferably from 0.25 to 3% byweight of insoluble, non-volatile silicone. If less than 0.01% by weightis present in the composition, little conditioning benefit is observed,and if more than 20% by weight is present, the hair will appear greasy.

The aqueous pre-formed emulsion may be incorporated into the shampoocomposition in an amount of from 0.02 to 40% by weight, preferably from0.2 to 20% by weight.

The exact quantity of emulsion will of course depend on theconcentration of the emulsion, and should be selected to give thedesired quantity of insoluble, non-volatile silicone, in the finalcomposition.

iii) Cationic Conditioning Polymer

A further component of hair treatment compositions of the invention is acationic conditioning polymer.

The polymer may be a homopolymer or be formed from two or more types ofmonomers. The molecular weight of the polymer will generally be between5,000 and 10,000,000, typically at least 10,000 and preferably in therange 100,000 to about 2,000,000. The polymers will have cationicnitrogen containing groups such as quaternary ammonium or protonatedamino groups, or a mixture thereof.

The cationic charge density is suitably at least 0.1 meq/g, preferablyabove 0.8 or higher. The cationic charge density should not exceed 3meq/g. It is preferably less than 2 meq/g. The charge density can bemeasured using the Kjeldahl method and should be within the above limitsat the desired pH of use, which will in general be from about 3 to 9 andpreferably between 4 and 8.

The cationic nitrogen-containing group will generally be present as asubstituent on a fraction of the total monomer units of the cationicconditioning polymer. Thus when the polymer is not a homopolymer it cancontain spacer non-cationic monomer units. Such polymers are describedin the CTFA Cosmetic Ingredient Directory, 3rd edition.

Suitable cationic conditioning polymers include, for example, copolymersof vinyl monomers having cationic amine or quaternary ammoniumfunctionalities with water soluble spacer monomers such as(meth)acrylamide, alkyl and dialkyl (meth)acrylamides, alkyl(meth)acrylate, vinyl caprolactone and vinyl pyrrolidine. The alkyl anddialkyl substituted monomers preferably have C1-C7 alkyl groups, morepreferably C1-3 alkyl groups. Other suitable spacers include vinylesters, vinyl alcohol, maleic anhydride, propylene glycol and ethyleneglycol.

The cationic amines can be primary, secondary or tertiary amines,depending upon the particular species and the pH of the composition. Ingeneral secondary and tertiary amines, especially tertiary, arepreferred.

Amine substituted vinyl monomers and amines can be poly-merized in theamine form and then converted to ammonium by cuaternization.

Suitable cationic amino and quaternary ammonium monomers include, forexample, vinyl compounds substituted with dialkyl amincalkyl acrylate,dialkylamino alkylmethacrylate, monoalkylaminoalkyl acrylate,monoalkylaminoalkyl methacrylate, trialkyl methacryloxyalkyl ammoniumsalt, trialkyl acryloxyalkyl ammonium salt, diallyl quaternary ammoniumsalts, and vinyl quaternary ammonium monomers having cyclic cationicnitrogen-containing rings such as pyridinium, imidazolium, andquaternized pyrrolidine, e.g., alkyl vinyl imidazolium, and quaternizedpyrrolidine, e.g., alkyl vinyl imidazolium, alkyl vinyl pyridinium,alkyl vinyl pyrrolidine salts. The alkyl portions of these monomers arepreferably lower alkyls such as the C₁-C₃ alkyls, more preferably C₁ andC₂ alkyls.

Suitable amine-substituted vinyl monomers include dialkylaminoalkylacrylate, dialkylaminoalkyl methacrylate, dialkylaminoalkyl acrylamide,and dialkylaminoalkyl methacrylamide, wherein the alkyl groups arepreferably C₁-C₇ hydrocarbyls, more preferably C₁-C₃, alkyls.

The cationic conditioning polymers can comprise mixtures of monomerunits derived from amine- and/or quaternary ammonium-substituted monomerand/or compatible spacer monomers.

Suitable cationic conditioning polymers include, for example: copolymersof 1-vinyl-2-pyrrolidine and 1-vinyl-3-methyl-imidazolium salt (e.g.,Chloride salt) (referred to in the industry by the Cosmetic, Toiletry,and Fragrance Association, “CTFA”. as Polyquaternium-16) such as thosecommercially available from BASF Tyandotte Corn. (Parsippany, N.J., USA)under the LUVIQUAt tradename (e.g., LUVIQUAT FC 370); copolymers of1-vinyl-2-pyrrolidine and dimethylaminoethyl methacrylate (referred toin the industry by CTFA as Polyquaternium-11) such as those commerciallyfrom Gar Corporation (Wayne, N.J., USA) under the GAFQUAT tradename(e.g., GAFQUAT 755N); cationic diallyl quaternary ammonium-containingpolymer including, for example, dimethyldiallyammonium chloridehomopolymer and copolymers of acrylamide and dimethyldiallyammoniumchloride, referred to in the industry (CTFA) as Polyquaternium 6 andPolyquaternium 7, respectively; mineral acid salts of amino-alkyl estersof homo-and co-polymers of unsaturated carboxylic acids having from 3 to5 carbon atoms, as described in U.S. Pat. No. 4,009,256; and cationicpolyacrylamides as described in our copending UK Application No.9403156.4 (WO95/22311)

Other cationic conditioning polymers that can be used includepolysaccharide polymers, such as cationic cellulose derivatives andcationic starch derivatives.

Cationic polysaccharide polymer materials suitable for use incompositions of the invention include those of the formula:

wherein: A is an anhydroglucose residual group, such as starch orcellulose anhydroglucose residual,

R is an alkylene axyalklene, polyoxyalkylene, or hydroxyalkylene group,or combination thereof, R¹, R² and R³ independently are alkyl, aryl,alkylaryl, arylalkyl, alkoxyalkyl, or alkoxyaryl groups, each groupcontaining up to about 18 carbon atoms, and the total number of carbonatoms for each cationic moiety (i.e., the sum of carbon atoms in R¹, R²and R³) preferably being about 20 or less, and X is an anioniccounterion , as previously described.

Cationic cellulose is available from Amerchol Corp. (Edison, N.J., USA)in their Polymer JR (trade mark) and LR (trade mark) series of polymers,as salts of hydroxyethyl cellulose reacted with trimethyl ammoniumsubstituted epoxide, referred to in the industry (CTFA) asPolyquaternium 10 Another type of cationic cellulose includes thepolymeric quaternary ammonium salts of hydroxyethyl cellulose reactedwith lauryl dimethyl ammonium-substituted epoxide, referred to in theindustry (CTFA) as Polyquaternium 24. These materials are available fromAmerchol Corp. (Edison, N.J., USA) under the tradename Polymer LM-200.

Other cationic conditioning polymers that can be used include cationicguar gum derivatives, such as guar hydroxypropyltrimonium chloride(Commercially available from Celanese Corp. in their Jaguar trademarkseries). Other materials include quaternary nitrogen-containingcellulose ethers (e.g., as described in U.S. Pat. No. 3,962,418), andcopolymers of etherified cellulose and starch (e.g., as described inU.S. Pat. No. 3,958,581.

Preferably the cationic conditioning polymer is selected from the groupcomprising cationic polyacrylamides, hydroxyalkyl cellulose ethers andcationic guar derivatives. Particularly preferred are Jaguar C13S with acationic charge density of 0.8 meq/g. Jaguar C13S is guarhydroxypropyltriamonium chloride. Other particularly suitable materialsinclude Jaguar C15, Jaguar C17 and Jaguar C16 and Jaguar C162, Apreferred cellulose ether is Polymer JR400.

As discussed above, we have surprisingly found that in compositions ofour invention, inclusion of cationic polymer enhances the wet propertiesof the shampoo without subsequent dry hair sensory negatives such asslippy feel leading to styling difficulties.

Advantageously, the amount of cationic conditioning polymer present incompositions on the invention is not governed by the requirement thatthese materials should act as a deposition aid for the siliconecomponent. The particular level appropriate in compositions of thepresent invention is dependent on the particular surfactant systememployed. Generally, the level can vary from 0.01 to 3% by weight.

The invention is also directed to the use, in a shampoo compositioncomprising a major proportion of a surfactant, of an aqueous pre-formedemulsion of an insoluble, non-volatile silicone having an averageparticle size in the emulsion and in the shampoo composition of from 2to 30 microns for imparting improved conditioning benefit to hair fromthe shampoo composition.

The shampoo composition of the invention may further comprise from 0.1to 5 % of a silicone suspending agent. Examples are polyacrylic acids,cross linked polymers of acrylic acid, copolymers of acrylic acid with ahydrophobic monomer, copolymers of carboxylic acid- containing monomersand acrylic esters, cross-linked copolymers of acrylic acid and acrylateesters, heteropolysaccharide gums and crystalline long chain acylderivatives. The long chain acyl derivative is desirably selected fromethylene glycol stearate, alkanolamides of fatty acids having from 16 to22 carbon atoms and mixtures thereof. Ethylene glycol distearate andPolyethylene glycol 3 distearate are preferred long chain acylderivatives. Polyacrylic acid is available commercially as Carbopol 420,Carbopol 488 or Carbopol 493. Polymers of acrylic acid cross-linked witha polyfunctional agent may also be used, they are available commerciallyas Carbopol 910, Carbopol 934, Carbopol 940, Carbopol 941 and Carbopol980. An example of a suitable copolymer of a carboxylic acid containinga monomer and acrylic acid esters is Carbopol 1342. All Carbopolmaterials are available from Goodrich and Carbopol is a trade mark.

Suitable cross linked polymers of acrylic acid and acrylate esters arePemulen TR1 or Pemulen TR2. A suitable heteropolysaccharide gum isxanthan gum, for example that available as Kelzan mu.

Depending on the type of composition employed, one or more additionalingredients conventionally incorporated into hair treatment compositionsmay be included in compositions of the invention. Such additionalingredients include styling agents, such as resins and hair-settingpolymers, perfumes, dyes, buffering or pH adjusting agents, viscositymodifiers, opacifiers, pearlescers, preservatives, antibacterial agents,antidandruff agents, foam boosters, proteins, moisturising agents, herbor other plant extracts and other natural ingredients.

The invention is further illustrated by way of the followingnon-limitative examples:

EXAMPLES

Shampoo compositions were prepared by mixing the following components inthe amounts stated:

Example 1

% wt Ammonium lauryl sulphate 14.0 Cocamidopropyl betaine 2.0 SiliconeOil⁽¹⁾ 2.0 Carbopol 980⁽²⁾ 0.4 Jaguar C13S⁽³⁾ 0.2 Preservative, perfume,q.s. viscosity modifier Water to 100.0 ⁽¹⁾Silicone oil was included asDC-1310 from Dow Corning Ltd., an emulsion of dimethicone (60,000 cs) innonionic surfactant. ⁽²⁾Carbopol 980 is a cross-linked polyacrylateavailable from B F Gcodrich. ⁽³⁾Jaguar C13S is guarhydroxypropyltrimonium chloride available from Celanese Corp.

Example 2

% wt Ammonium lauryl sulphate 14.0 Cocamidopropyl betaine 2.0 Siliconeoil⁽¹⁾ 2.0 Carbopol 980 0.4 Ethylene glycol monostearate 1.5 Jaguar C13S0.2 Preservative, perfume, q.s. viscosity modifier Water to 100.0 ⁽¹⁾asExample 1

Example 3

% wt Sodium lauryl ether sulphate 2EO 12.0 Cocamidopropyl betaine 4.0Silicone oil⁽¹⁾ 0.5 Carbopol 980 0.4 Jaguar C13S 0.03 Ethylene glycolmonostearate 1.5 Preservative, perfume, viscosity q.s. modifier Water to100.0 ⁽¹⁾as Example 1

All the shampoos of Examples 1-3 are prepared using a simple coldprocess whereby all the ingredients are mixed using a paddle stirrer.

The silicone particles in the emulsion have a mean particle size of 7.7microns and remain the same in the shampoo composition.

Example 4 and Comparative Example A

Evaluation of the wet/dry conditioning performance of shampooformulations incorporating pre-emulsified silicone of different particlesizes and with or without cationic polymer.

Test Shampoos

Shampoo compositions were prepared containing ingredients as shown inthe following Table. Example 4 is a formulation according to the presentinvention. Comparative Example A is a formulation in which thepre-emulsified large particle size silicone of Example 4 has beensubstituted by an equivalent amount of a pre-emulsified smaller particlesize silicone as described in the prior art. Control 1 is theformulation of Example 4 minus cationic polymer (Jaguar C-13-S). Control2 is the formulation of Comparative Example A minus cationic polymer(Jaguar C-13-S).

Example Ingredient 4 Control 1 Comp. Ex. A Control 2 SLES 14 14 14 14(100%) CAPB 2 2 2 2 (100%) Jaguar 0.2 — 0.2 — C-13-S DC-1310 3.3 3.3 — —(60%) BY22-026 — — 4 4 (50%)⁽¹⁾ Carbopol 0.4 0.4 0.4 0.4 980 Formalin0.1 0.1 0.1 0.1 water to 100 to 100 to 100 to 100 ⁽¹⁾BY22-026 is anemulsion of 60,000 cs dimethicone with a particle size of 0.5 microns,ex Toray Silicone Co.

Conditioning Performance

The conditioning performance of each of the above test shampoos wasevaluated as follows: 7 g of hair in the form of a switch was worked in0.7 g of the test product, lathered for 30 seconds, and rinsed withwater. The procedure was repeated once. Three switches of hair wereprepared for each product to be evaluated. The evaluation ofconditioning performance was carried out by twelve trained panellists asa paired comparison test and significant differences at greater than 95%confidence were assessed.

Results

Results are shown in the following table, with each row includingentries for two shampoos being compared in the form of relativeallocation of a total score of 100, a higher score indicating preferencefor that member of the pair.

The two attributes assessed by the panellists were (a) ease of wetcombing and (b) ease of dry combing.

The results were as follows:

Ease of wet comb Ease of dry comb Example 4 versus 70 26 Control 1 Comp.Ex. A versus 72 80 Control 2

The results show that:

Example 4 gives significantly greater ease of wet combing than Control 1on ease of wet combing

Control 1 gives significantly greater ease of dry combing than Example4.

Comparative Example A gives significantly greater ease of wet and drycombing than Control 2.

Conclusions

Example 4 according to the invention shows that inclusion of cationicpolymer increases the ease of wet combing imparted by the formulationand reduces the ease of dry combing.

Comparative Example A shows that if the large particle sizepre-emulsified silicone of the invention is substituted with a smallerparticle size pre-emulsified silicone according to the prior art, then aselective increase in wet combing performance is not observed. Incontrast to the Example of the invention, Comparative Example A showsthat inclusion of cationic polymer increases the ease of wet combingimparted by the formulation but increases the ease of dry combing (asexpressed by panellist preference) to a greater extent.

What is claimed is:
 1. An aqueous shampoo composition comprising, inaddition to water: i) at least one surfactant chosen from anionic,nonionic, zwitterionic or amphoteric surfactants or mixtures thereof;ii) emulsified particles of an insoluble, nonvolatile silicone selectedfrom the group consisting of polyalkyl siloxanes, polyalkyl arylsiloxanes, and silicone gums; iii) a soluble cationic hair conditioningpolymer having a cationic charge density of about +3.0 meq/gram or less,in which the emulsified particles of insoluble, nonvolatile silicone areincorporated into the shampoo composition as a preformed aqueousemulsion having an average silicone particle size in the emulsion and inthe shampoo composition of from 2 to 30 microns.
 2. A shampoocomposition according to claim 1, in which the at least one surfactantis present in an amount of from 0.1 to 50% by weight of the composition.3. A shampoo composition according to claim 1, in which the anionicsurfactant is selected from the group consisting of sodium laurylsulphate, triethanolamine lauryl sulphate, triethanolamine monolaurylphosphate, sodium lauryl ether sulphate 2EO, sodium lauryl ethersulphate 3EO, ammonium lauryl sulphate, ammonium lauryl ether sulphate1EO, ammonium lauryl ether sulphate 2EO, ammonium lauryl ether sulphate3EO and mixtures thereof.
 4. A shampoo composition according to claim 1,in which the amphoteric surfactant is selected from the group consistingof cocamidopropylbetaine, lauryl betaine and sodium cocamphopropionate.5. A shampoo composition according to claim 1, in which the insoluble,non volatile silicone is present in an amount of from 0.01 to 20% byweight of the composition.
 6. A shampoo composition according to claim1, in which the insoluble, non volatile silicone is selected from thegroup consisting of polydimethylsiloxanes.
 7. A shampoo compositionaccording to claim 1, in which the cationic hair conditioning polymer ispresent in an amount of 0.01 to 3% by weight of the composition.
 8. Ashampoo composition according to claim 1, in which the cationic hairconditioning polymer is selected from the group consisting of cationicderivatives of guar gum, cationic cellulose ether derivatives andcationic polyacrylamides.
 9. A method of making the aqueous shampoocomposition of claim 1, comprising mixing together water, thesurfactant, the cationic conditioning polymer and a preformed aqueousemulsion of the silicone, wherein the silicone in the emulsion and inthe shampoo composition has an average particle size of from 2 to 30microns.
 10. A shampoo composition according to claim 1, wherein theinsoluble nonvolatile silicone is dimethicone.
 11. A shampoo compositionaccording to claim 1, wherein the insoluble nonvolatile silicone ispolydiethyl siloxane.
 12. A shampoo composition according to claim 1,wherein the non-volatile silicone is an emulsion of dimethicone of60,000 cs in nonionic surfactant, wherein said non-volatile silicone isin the form of particles having a mean particle size of about 7.7microns.